Or because they're just faced off dead flat..... What's so hard about that on a lathe?You may have noticed that cylinders, made on a lathe, never wobble when stood on end? That is because of that very slight concave surface.
£150, 1 week turnaround.
I'm sure someone else on here can beat that, though.
Yep I’m not saying it’s been a while but since then West Ham have won the Premier League title 3 times, Rail workers have finally agreed a pay settlement and Mylie Cyrus is now president of the USA..I think that price, if a ‘quote’, might not be enough - being as the specs have changed so much from the original.
Draw it, with dimensions, even using pencil, rule and paper. Your far more likley to get the right thing made!No key way needed thanks and right hand thread please.. picture was just an example ..
That was a valid quote, with allowance made for client change of scope, and some f-around time finding out exactly what the client wants (which was proven exactly right by this thread). A rough drawing with valid dimensions produced, and go-ahead from client before manufacture.I think that price, if a ‘quote’, might not be enough - being as the specs have changed so much from the original.
I'd be very concerned if a decent lathe couldn't give a flat face.
That’s a good spot … thank youHow critical are your dimensions?
You could perhaps get something like this
https://www.castors-online.co.uk/product/100mm-aluminium-high-temp-wheel-4568
Which will give you the rough component, and then just adjust the bore and skim the surface to the desired flatness. It would be undersize though, obviously.
Just a thought, might be worth a bit of googling to see if you can find something that is 90% of the way there.
Rabithole allert!Lathes would be scraped in and set up to face slightly concave precisely for the reason above - to guarantee a non-wobble.
You can look in the Schlesinger book of words to find out the allowable tolerance (page 49 & 50, fig 15 here: https://www.pearl-hifi.com/06_Lit_A...s/Schlesinger_Georg/Testing_Machine_Tools.pdf).
You do it that way so as it wears, it will wear in (improve or approach flatness) before it wears out (becomes convex). It is the same with a tailstock. You would set it slightly high so that as it wears, it approaches centre height before wearing further until it is too low.
I so appreciate all your ideas and views etc.. Thank you all…
Ha.., i’ve been there and past it unfortunately in a previous life.. I guess that’s why i so appreciate now the friendship enthusiasm and encouragement you get on here..I can pm the Samaritans hotline number if you think it would help.
Bob
I have a 4” diameter Ali billet here, if it’s just a matter of parting a bit off and putting an m14 thread through the middle I may be able to help.Ha.., i’ve been there and past it unfortunately in a previous life.. I guess that’s why i so appreciate now the friendship enthusiasm and encouragement you get on here..
Lathes would be scraped in and set up to face slightly concave precisely for the reason above - to guarantee a non-wobble.
You can look in the Schlesinger book of words to find out the allowable tolerance (page 49 & 50, fig 15 here: https://www.pearl-hifi.com/06_Lit_A...s/Schlesinger_Georg/Testing_Machine_Tools.pdf).
You do it that way so as it wears, it will wear in (improve or approach flatness) before it wears out (becomes convex). It is the same with a tailstock. You would set it slightly high so that as it wears, it approaches centre height before wearing further until it is too low.
Ha..,, And Thank you ..Perhaps it is just me, but I didn't find it particularly hard to visualise what Noods was requesting in his original post.
Not really sure where the relevancy of the flatness of the faces of discs and lathe geometry comes in.
It is a non-cambered sanding belt wheel, and the level of precision need only be commensurate to the application. Pretty self explanatory to my mind...